User ManualTable of ContentsINTRODUCTION1SEA 157 SPECIFICATIONS22.1 General22.2 Transmitter22.3 Receiver22.4 Mechanical22.5 DSC controller2OPERATING THE SEA15733.1 Front panel controls33.2 Display33.3 Push to talk33.4 Radiotelephone operating system functions33.5 Digital selective calling operating system33.6 Receiving a call33.7 Inputting position data and time33.8 Programming the DSC ID (MMSI)33.9 Programming the DSC Address Book33.11 Master USA frequency list33.12 International Channel list33.13 Weather Channel list3INSTALLATION44.1 Preliminary check44.2 Shelf or overhead mounting44.3 Bulkhead mounting44.4 Power supply wiring44.5 Antenna wiring44.6 External speaker wiring44-7 NMEA 0183 input wiring4THEORY OF OPERATION55.1 Frequency synthesizer55.2 Modulation circuit55.3 Receiver circuits55.4 Transmit amplifiers55.5 Antenna interface circuits55.6 Automatic RF power control and TX logic55.7 TX Logic detector55.8 Power and Audio circuits55.9 Microcomputer circuitry55.10 Keypad/keypad lighting55.11 Display/display lighting5MAINTENANCE66.1 General66.2 Recommended test equipment66.3 Basic performance tests66.4 Transmitter alignment66.5 Receiver alignment6SCHEMATICS7Front view of SEA 1572Rear view of SEA 1572Outline Dimensions of SEA 1574Transmitter test setup6Receiver test setup6RF Mainboard schematic diagram, Sheet 57VCO Circuit Board schematic diagram7Size: 57 KBPages: 37Language: EnglishOpen manual
Internal PhotosTable of ContentsPAGE 10-41FCC IDENTIFIER: BZ6SEA157 FIGURE 10.31FCC IDENTIFIER: BZ6SEA157 FIGURE 10.42Size: 274 KBPages: 2Open manual
External PhotosTable of ContentsPAGE 10-21PAGE 10-32FCC IDENTIFIER: BZ6SEA157 FIGURE 10.22Size: 224 KBPages: 2Open manual
